Back support belt



FIG. 1 is a perspective view showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof; and,

FIG. 4 is a perspective view of the back support belt shown in an environment.

Throughout the figures, stitching patterns of the design as claimed are shown in even-length broken lines. However, the broken lines outside the description of FIG. 4 pertaining to the back support belt merely represents the environment that forms no part of the claim. 

CLAIM The ornamental design for a back support belt, as shown and described. 